FAQ

You can find our online manual here:

https://help.grellaudio.com/grell/grell-tws-1

How can I reset the earbuds?

Simple reset can be performed by placing the earbuds back in their charging case and delete the pairing history by going to your Bluetooth settings in your paired device and “forget paired device” on the “grell TWS/1”. And then go through the pairing set up again.

How can I perform a factory reset?

Tap and hold the touch field on each earbud simultaneously for 10 seconds. Then place the earbuds back in their charging case and delete the pairing history by going to your Bluetooth settings in your paired device and “forget paired device” on the “grell TWS/1”. After the reset, the earbuds must be paired manually to a compatible device.

How do I update the firmware?

Firmware updates can be accessed via the SoundID app. For more information on the app please follow below link:

https://grellaudio.com/en/content/view/SoundID

Do the earbuds support Mono mode?

Yes you can listen to music or take calls using one earbud at a time.

How can I increase the bass?

We recommend making sure the eartips used create a good seal to ensure the best bass. It is also recommended to create your own SoundID profile to tune the earbuds to your liking through the SoundID app.

Where can I order replacement foam tips?

You could buy Mandarines Symbio W, Acoustune AT-07, and then same Comply tips as the Sennheiser MTWS or IE 900 uses (Comply 200 series or 400 series). The Comply T200 series have to stretch a bit more to fit over the flared nozzle lip and the main bore tube, so they would be a bit more difficult to attach but they would stay attached more firmly. I don’t know for sure if they’re too long to fit on the IEM and fit inside the case. Customer found these on Amazon that fit:

https://www.amazon.com/Earphone-FEYCH-Replacement-4-5-6-3mm-Earphones/dp/B07SN4HP5Z

 
What is NAR?

When the environment is noisy the TWS/1 blocks it out passively in the high mid and high frequency range. For the low and low frequency range the ANC function can be activated. A very strong noise reduction in the low frequency range makes higher, more annoying, frequencies more audible. Therefore, the new grell Noise Annoyance Reduction (NAR) technology (patent pending) scans the noise spectrum and controls the ANC using a psycho- acoustic model for a minimum of annoyance.

 
Do the earbuds have transparency/ambient sound mode?

Yes the earbuds do.

 
What should I check if my earbuds are Bluetooth connected but music is not streamed to the earbuds?

This is likely due to an incorrect pairing issue. Pair the headphones again or reset them.

 

What should I check if I can’t hear anything when using the earbuds?

This is likely due to an incorrect pairing issue. Pair the headphones again or reset them.

 

What should I check if I can’t pair the earbuds with my Bluetooth device?

This is likely due to an incorrect pairing issue. Pair the headphones again or reset them.

 

What should I do if the earbuds do not appear on my device’s Bluetooth list or I am not able to pair my headphones?

Reset the headphones and try again. Often turning on and off Bluetooth on your device might help as well. Your headphones might also be paired with a different device, so you might have to unpair them with that device before you pair them with a new device. You can also manually start the pairing on the earbuds if you tap and hold the touch field on each earbud simultaneously for 3 seconds.